AEVA Forums

but you would have to send it commands all the time at 2400 bps, and the commands are not documented. Is this data only for relay state? I can't see any other reason for the scc to receive data unless it's error checking. What if you bypass the relays? When the main board sh*t itself last time the ...

Just out of warranty, of course.

Is it possible to use the scc board as a stand alone?

Might get a victron multiplus, can use shore assist mode to boost the output of my small victron Phoenix

63A breaker tripped, but too late I guess. 125A fuse didn't blow.

Seems there is more damage. I ran a wire over but it didn't solve it.

These things die way too easy

My pip died again. A minor short circuit elsewhere in the system caused this on the scc board: http://forums.aeva.asn.au/uploads/4186/rps20170117_132438.jpg http://forums.aeva.asn.au/uploads/4186/rps20170117_132412.jpg http://forums.aeva.asn.au/uploads/4186/rps20170117_132311.jpg Do you think it's j...

Could one of you explain slowly the theory here? I understand the inductor filtering out the frequency part. But why is the factory way wrong / inefficient? Is it cost issue? Space?

I have a spare inductor so I could replicate this

The main benefit of Lithium, is that it's charge efficiency is much higher. This means less solar panels required, less racking for them, less charge controllers etc. Or, it means a faster recharge, giving a fully charged bank at 5pm on a rainy day, compared to a half recovery in lead acid See this ...

Both methods are bad, so I invented dynamic balancing

dynamic balancing of Lithium

Pretty cool. Arduino coding is a bonus. RF remote not in the model you gave link to, must be another upgrade model. Sounds like what you are looking for SJ. What I'm trying to figure out is how to effectively reduce the load requirement for the pips power saving mode. At the moment if I open the mic...

These WiFi gadgets give the illusion of convenience. 1. Disconnect from normal WiFi 2. Request connection to aux WiFi for the device 3. Start the app 4. Switch the device 5. Close the app 6. Disconnect from aux wifi 7. Request connection to normal wifi I prefer Bluetooth devices. It doesn't require ...

Just curious, why (in general) have such a high 'low voltage cutoff' ? 44-52 is 2.75-3.25. 3.33v normal when not charging....a large load and it would surely trigger at a high soc? I mean 3.25 very close to 3.33... Am I missing something? On another note, all these changes make going to 17S easier. ...

40 cells is not a problem, just add some port expanders

There are small bms's for small packs, and there are big bms's designed for EVs. But there is nothing in between for off grid solar etc. So in the absence of a suitable device, we have no alternative but to build from arduino / pi etc

Ve.direct is proven protocol, it will also work with ve.direct monitoring equipment (eg Bluetooth dongle) which could be enormously beneficial to many

https://www.victronenergy.com/live/vedi ... otocol:faq

Would anyone be interested in building my design for an arduino based BMS using dynamic balancing? https://youtu.be/Rqh2WRbo7ww This BMS was designed and built by myself because an off the shelf BMS has the following issues: 1. Inadequate charge current  2. Inadequate discharge current  3. Insignifi...

Great stuff

Would it be possible to make the pip output qpigs data once per second without a request? (how victron products do it)

Exactly. People always assign a zero value to solar power, when the truth is, every kwh has a cost. All the equipment necessary to create, store and convert that kwh has a cost and a limited number of hours. Do the sums, it is quite high. Often using off peak works out better

By heat pump I mean heat pump only, not an all in one. You can add one to an existing cylinder

You should get a victron multi plus. Ultra low consumption and can act as a grid tie (in your case the pip could be the grid) but you should only run the victron at night. That way you get your 8kw without high consumption, in fact you would reduce consumption since the victron draws 8w I see no nee...

Solar Junky wrote:That is one cool BMS system!

Cooler than mine?
A better BMS with unlimited everything

But they have the worst efficiency. Something like 2v charge and 1.4v nominal? Efficiency is #1 in my book

I am also in a discussion with a guy who must be one of the top 5 in the world re battery technology. He consults to SpaceX and Nasa. I asked him about the most efficient way to use lifepo4 with a secondary consideration being life. He suggests going to 17S, read below: "I haven't tested the specifi...

Let's say you want to use 1kw to charge. Just by having the pip connected, you waste 50w. So the actual consumption is 1050w. Let's assume the charger is 90% efficient. Your 1000w is now 900w. Your batteries store 50% (being generous) of that 900w. It's now 450w. When you run the inverter from the b...

LEAD ACID PARADOX So I was having a debate with someone on another forum. He was charging his agm bank at night using off peak (no solar), then running his pip during the day. I explained that this was costing him money instead of saving it. He strongly disagreed, explaining to me that agm was 100% ...

I have several of these, cheap and very good quality clone. Plus it has serial out, no crc requests required
http://s.aliexpress.com/vuUV7fyQ

[ Edited Coulomb: removed spaces from URL (prevents it from working) ]

Even though they state:



?

Well that's a pain. Haven't powered up yet so don't know what it has. So I noticed some changes in the new board. Let's play: what's been removed and why? http://forums.aeva.asn.au/uploads/4186/rps20160916_212303.jpg Both appear to have been filtering of the 230v, one on the input and other on the o...