Search found 3925 matches

by coulomb
Yesterday, 10:55
Forum: Renewable Energy and Storage (Non-EV)
Topic: jonescg's home battery storage system
Replies: 43
Views: 5647

Re: jonescg's home battery storage system

The A/C unit is a Fujitsu DC inverter type, so it's after a ~340 V DC bus (I assume). Would it not be possible to supply this same bus with rectified 3-phase? Rectified 3 phase comes to just under 600 V; that's why trams (light rail) often ran at 600 VDC. The IGBTs may well not be rated for 600 V o...
by coulomb
Yesterday, 10:52
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 232
Views: 20767

Re: PIP-5048MK inverter

I have observed lately that when the sun is shining bright and consistent, the mppt clips the production below 2900w from a total pv of 4600w. ... Is this normal behavior for the mppt to clip solar production even when the batteries are not fully charged ? I was running a total load of about 1800w ...
by coulomb
Yesterday, 09:50
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2580
Views: 541642

Re: PIP-4048MS and PIP-5048MS inverters

In the PIP4048/5048s you can limit the max charging current (solar + grid - option 2), lets say 60A. If you set max grid charging to say 2A (option 11), then max solar charging should be 58A. Is my assumption here correct? You'll be allowed to charge up to 60 A from solar, as long as the Utility is...
by coulomb
Sun, 05 Apr 2020, 10:16
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

Can someone validate this : My string generate 8.3 A at 99 V, a perfect resistor would be 12 Ohm. But my resistor is not perfect, I put one of 10 Ohm => will the voltage be : V = 10 x 8.3 = 83 V ? I suppose no, both voltage and current will drop.. but where ? That one is easiest to solve graphicall...
by coulomb
Sun, 05 Apr 2020, 07:11
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

That would mean that to stay within 90% of efficiency we can't go further then 10% of the perfect resistance. To help with that, instead of using resistances in a 1:2:3 ratio, perhaps use a 1:2:4 ratio instead. As it is now, you have two ways of choosing 9 ohms, 3+6+0 or 0+0+9. If you used 2.6, 5.2...
by coulomb
Fri, 03 Apr 2020, 21:10
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

Question : If the panel at 1000W/m2 irradiance is connected to the perfect resistor that is at max power point (that is 3.5 Ohm and should provide 315W) .. will it provide the intended voltage and current (33V and 9.5 amp) ? Yes. I could connect one resistor, starting with the 3 Ohm ... calculate p...
by coulomb
Fri, 03 Apr 2020, 08:32
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

it seems to be, should i consider the resistor as a flow reducer that generate heat ? Like only 4 liters par min can go pass through, so it can be low pressure with high rate of flow or high pressure with low rate... but only 4l/min will pass through ? The 4 liters being the Resistor Ohm value ? Um...
by coulomb
Thu, 02 Apr 2020, 19:39
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

Ok, so that's rated for V = √(P·R) = √(2000 · 7) = 118 V. Perhaps it's designed for 120 VAC. Hellooo, For what i've read, a resistor got no working "voltage"... it got 2 parameters, internal resistance and Max power output it can accept, more then this power.. it blow out. (with perhaps a tolerance...
by coulomb
Thu, 02 Apr 2020, 11:57
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

I think you are missing the fact an MPPT controller needs to see a battery voltage so it can determine the voltage/current that is the optimum output from the input it sees. I assumed that it would just try larger and larger PWM duty cycle until the maximum current flowed. Maybe some would be surpr...
by coulomb
Thu, 02 Apr 2020, 07:16
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

I think i misunderstand some concept.. :D, let's say i got a 7 Ohm resistive element rated for 2000W Max. Ok, so that's rated for V = √(P·R) = √(2000 · 7) = 118 V. Perhaps it's designed for 120 VAC. I'm applying 33V and 2A, what is the power dissipated by the element ..? And if now i apply 33V and ...
by coulomb
Wed, 01 Apr 2020, 21:19
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 206
Views: 21195

Re: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)

The battery was at 52% SoC and voltage was at 49.1V then and dropped to 48.2V when the water cooker was turned on. Yes, factory firmware suffers from a lack of battery voltage load compensation (no KettleKomp™). Which settings do you suggest for pylontech batteries? I don't use a Pylontech, but thi...
by coulomb
Wed, 01 Apr 2020, 21:14
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2580
Views: 541642

Re: PIP-4048MS and PIP-5048MS inverters

The spec. for the Pylontech mention as max. Volt is 54,00 54.0 V is an average of 3.6 VPC (for 15S like Pylontech 48V); 3.6 V is the highest voltage an LFP cell should ever see. So you should not be charging to anywhere near 54 V. Should I lower the value on the Inverter by 0.2 V or 1.4V independed...
by coulomb
Wed, 01 Apr 2020, 19:46
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

Is there a device able to transform whatever Voltage x Amp (max 140V, max 40 Amp) to a linear Voltage x Amp .. ? In short, a DC to DC convertor with variable input and variable output, output just have to be linear, this line will depend on the resistance of the element. It seems to me that an off-...
by coulomb
Wed, 01 Apr 2020, 19:28
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 206
Views: 21195

Re: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)

After a couple of hours, it switched back to battery this morning. The battery voltage has to exceed the back-to-battery voltage setting (setting 13) before the inverter can switch back to battery mode. But even when that condition is satisfied, there is a minimum stay of 10 minutes in line/bypass ...
by coulomb
Wed, 01 Apr 2020, 19:24
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 206
Views: 21195

Re: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)

My PIP5048MG did similar a couple of days ago. It had a peak 6.0KW load while running off solar/batteries, and went to Line Mode, but it didn't go back to Battery Mode after the load dropped. No fault indication on the local panel. Did you wait 10 minutes? Unpatched firmware forces the inverter to ...
by coulomb
Tue, 31 Mar 2020, 22:05
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

solamahn wrote:
Tue, 31 Mar 2020, 18:45
You could just connect panels direct to the hws heating element.
I would think that you'd want some sort of over-temperature protection, even if in your part of the world it might rarely be needed. And the stock thermostat would only be AC rated.
by coulomb
Tue, 31 Mar 2020, 21:54
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 451
Views: 29768

Re: PIP inverter repairs and hardware modifications

Any fan with same dimensions and pwm with 4 wires will work. Better and quieter. Maybe the hardware has changed such that this is no longer an issue, but recall that Weber had to replace the original fans in one customer's inverter. [ Edit: due to intermittent fan locked warnings, which might obscu...
by coulomb
Mon, 30 Mar 2020, 06:24
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 232
Views: 20767

Re: PIP-5048MK inverter

btw, it seems that i also had a dip today. One dip, if it lasts only a minute or so, is OK. It just means that you had a biggish load that brought down the battery voltage enough that it started another bulk charge. To go from float to bulk stages, it seems to have to go through a short zero charge...
by coulomb
Sun, 29 Mar 2020, 18:29
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 232
Views: 20767

Re: PIP-5048MK inverter

I had the baud rate at 9600 because I had seen that value somewhere (can't remember where). The main part of firmware updates happens at 9600 bps, although the initial negotiations are at 2400 bps. I changed it to 2400. No difference. Watchpower should be setting the bit rate; no need for the user ...
by coulomb
Sun, 29 Mar 2020, 08:09
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

But .. for what i've read, the PIP 5048 got 3 modes : ON under load, ON without load (45W) and idle mode what i call sleep mode which is 15W .. m i right on the values here ? Cause 15W is perfectly acceptable. And if i remember correctly, the peep wake up from idle mode when the "demand" rise over ...
by coulomb
Sat, 28 Mar 2020, 19:52
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2580
Views: 541642

Re: PIP-4048MS and PIP-5048MS inverters

As i have to spend more time at home i did some tests on my 4048 with 73d firmware .... I guess you mean patched firmware version 73 .00 d. 3) Did the update got something in it to avoid to take in account the setting 12 below 48v. My guess is that you have the low DC cutoff (setting 29) set to 47....
by coulomb
Sat, 28 Mar 2020, 07:26
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 1103

Re: Inverter for 48v off grid - PIP xxxxx or something else?

- 24x300W Panels (JA solar Bifacial: https://www.jasolar.com/html/en/2018/en_smodule/8.html) I strongly don't recommend connecting 7.2 kW of panels to an inverter (any brand or model) that is rated for 4 kW of PV. I know it will only use what it needs in theory, but the Solar Charge Controllers ass...
by coulomb
Wed, 25 Mar 2020, 18:54
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 451
Views: 29768

Re: PIP inverter repairs and hardware modifications

The voltages are to low. The 12V is 11.2V. The 15V is 14V. All the capacitors are good If it was just that the voltages are low, I'd suspect the source resistors and components back to the Isense input (R205, R215, R225, C82), or possibly U10 itself. The inverter starts up and works for about 30 se...
by coulomb
Wed, 25 Mar 2020, 08:15
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 232
Views: 20767

Re: PIP-5048MK inverter

I have the SOL-I-AX-5kP (Axpert King) The "K" in the model name is for King, not kilo. So it should be capitalised to reduce confusion. purchased in February 2020 (not sure how to check the manufacture date). There should be a small sticker on the side showing the year of manufacture, and with the ...
by coulomb
Tue, 24 Mar 2020, 22:38
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 293
Views: 45683

Re: 4Springs' Brumby

antiscab wrote:
Tue, 24 Mar 2020, 20:40
are you trying to drive on the pre-charge resistor only?
That has a familiar ring to it. I seem to recall exploding a pre-charge resistor on a certain MX-5.