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here you go; I was out traveling but am home now. it all fits in to a group-31 battery case ($12 on amazon). there is a little reptile heater attached to each side (7watts / 120volts) which you can't see. I used 1/8" x 1" solid copper bar to make the buss bars. Note that I used double...

here you go; you'll notice the copper bus bar in the upper right with the red tape. this is the only photo I have as the batteries are currently in use in our 5th wheel and we're on a trip. Dave...

I like this idea. maybe an arduino would work as the victron.direct interface between the BMV-712 and the output relay board ? I will confess I don't know much about victron.direct so will have to read up on it. I am currently using the BMV-712 relay for controlling my battery heaters thru a...

they are in a 5th wheel; so no engine. I use them just as a house battery bank. if you're using LiFePO4 as a start battery on a diesel I would look carefully at how much current you would be pulling thru the batteries for that. My truck/tow vehicle (3500HD) has two batteries for that...

I know a lot of people have had good success (including me) in making your own using the 280ah cells that are immensely popular. I have three now for my 5th wheel. (840ah total which is equivalent to 8 100ah battle borns) just one 12v battery made from them fits in a group 31 battery case...

good day; I have the BMV-712. (I'm not sure if the smart shunt is any different) It's fully integrated with the smartsolar SCCs. I know that they get the temperature from the BMV-712. Once I modified the charge profile to only go to 14V and not 14.2 the high voltage alarms stopped...

mine are stuck on the short side of the stack. 2 per battery and that seems to be fine. each cell gets an even amount of heat as the others.

that is pretty close to what I see on my battery heaters performance wise. I have a pair of 12V 280ah LFPs batts. each bat has a pair of 7W reptile heaters affixed to each side (powered by the inverter) and it takes about 2.5 hours to heat up. (total 28W load for heating) they turn on at 42...

I've used A1solarstore.com twice now for my panels. they have a flat shipping rate of $175 for anywhere in the lower 48. The more panels you order the better the overall price.

these are what I use for my 280ah batteries. one on each side. they work really well but you need an inverter and a heat controller to turn them on and off. I use the relay on my BMV-712 for that.

Will; got another use for your new freezer. after you destroy a couple of batteries. how about a couple of different tests on battery heaters ? A single heater on the bottom of a 4s pack of 280ah cells. how much power to go from 32degF to 50degF, then a pair of heaters on each side...

sorry; all my temps are in Fahrenheit. so zero was actually freezing (32 deg F)

Dzi: I did; it went really well and works great. I did a short write up on it here. https://diysolarforum.com/threads/using-bmv-712-relay-for-battery-heating.11310/

Good day; I almost hate to wade in here as this has been an interesting conversation. But for me: My 280ah batteries for my RV have a 14w heater on each side for a total of 28 watt consumption. The testing I did last spring showed that the heaters could increase the temperature of the battery...

if it's any help; I went with 2 separate 12v batteries each with their own 200a daly BMS on my 5th wheel (3kw inverter). by effectively splitting the load across the two batteries it derates the daly BMS by about 2 as I didn't feel comfortable with the cabling on the BMS. each battery has...

Daly 200a 4s 4s (2 12v batteries in parallel each with own BMS) 250a (30a inverter) $115 each. very satisfied aliexpress.com

For my setup in our 5th wheel I also have a 3kw inverter. to avoid the high current issue I use 2 12v batteries (280ah Eve cells) in parallel. each has a 200a daly BMS on it. at max output current each battery will only have 150a but that is max. I have yet to even come close to that...

the two 100/50 SCCs are networked in to the BMV-712.

The BMV-712 has a high voltage alarm at 14.6 and I've had 4 of them so far this summer. I agree that if the charge stage ends at 14.2 that it can't get to 14.6 but it is. (there is no other charge source) I was thinking that the alarm was occurring during the absorption period but maybe...

so this summer I've gotten several high voltage alarms (14.6v) with my pair of LiFePO4 batteries (280a EVE cells). so investigating the victron SCC profile; the full charge voltage is 14.2 (looks correct) and the float charge is 13.5 (also correct) but then I noticed a little blip in the...

For those interested; for each of my LFP280ah batteries I am using a pair of 120v (16w) heating pads. When tested earlier in the spring they worked well and increased the temp by about 10 deg in an hour as I monitored them. But there isn’t any temperature control. So for this I’ve decided to...

I'm using a regular daly 200a BMS on each battery. with my equipment and my configuration each BMS will see about half their rated capacity.

I bought 8 of these from them back in January; they are great. I made a pair of 280ah 12v batteries and currently using them for our 5th wheel.

interesting idea; it isn't code but it would probably work. although I'm not sure your current / breaker totals are correct. IE: one 30a breaker feeding in to two 20a breakers. but you're probably thinking that the down stream circuits won't approach the 30a total. I'm essentially...

I totally disconnected my converter. my inverter is a combo inverter/charger (charger section currently turned off) but it is easy enough to turn it on if I want to charge for a bit from shore power or from a generator on cloudy days.

I used these inline breakers for my solar panel disconnects on our 5th wheel. they work great and are quickly accessible. link to amazon https://www.amazon.com/gp/product/B07X49RMYK/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1

none of the daly BMS's have low temp cut off. I have a pair of victron SCC's however and they will not charge below their (configurable) low temp setting. (temp comes from BMV-712) I also have a pair of heating pads on the side of each battery that do a great job of warming up the batteries...

Not much to say about the BMS; it's just there. I assume it's working. using the batt-go cell monitor I'm usually within 10 to 14 mv. if you make a single battery (2s4p) with one BMS your overall current could be very high. I split my bank in to two batteries. using two BMS effectively...

I have your exact battery bank already you are going to build. I used a 200amp daly BMS in each battery. but yes. you want a BMS. I used a group 31 automotive box for everything. that's the daly BMS on the left. with your 3kw inverter each battery will only experience 125 amps at max...

I have 4/0 wires on my 5th wheel (3 feet long) and I did put a twist in them right before they connect to the inverter. wasn't hard at all. I can't say it helped but it hasn't hurt. Everything I read said the twist was a good thing. it is supposed to cut down on RFI interference if I...

I have 3 x 330 watt solar panels on my 5th wheel and they are great. (canadian solar) very rugged and the frame is solid.

right now the port side is facing more or less west because it's at the house. with the available real estate didn't have many options for placing the panels, they are fairly large. the panels are in parallel due to shading. was going to experiment was a long leg for one panel and a...

was wondering if anyone has looked at using the low temperature relay on a victron BMV-712 to turn on and off a battery heater ? the relay output could connect to a solid state relay that would switch the current to the battery heater; (either AC or DC).

just finishing up installing solar panels on my 5th wheel using brackets I made this winter. three panels of 330watts each. the brackets allow tilting in two directions. port and starboard. the brackets were easy to make out of two pieces of angle aluminum. Attachment to roof is by 1"...

this was very useful info; thank you.