diy solar

diy solar

Recent content by backwash

  1. B

    Opinions on how I'm connecting these 32 * LFP 280Ah cells (16S2P)

    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...
  2. B

    Opinions on how I'm connecting these 32 * LFP 280Ah cells (16S2P)

    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...
  3. B

    Victron Direct

    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...
  4. B

    Overland build

    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...
  5. B

    Overland build

    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...
  6. B

    Getting High voltage alarms on Victron SCC and LiFePO4 battery bank.

    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...
  7. B

    LiFePO4 heating pad for cold temperatures

    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.
  8. B

    LiFePO4 heating pad for cold temperatures

    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...
  9. B

    Where can I buy some good solar panels

    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.
  10. B

    Winter Heat For Battery Bank

    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.
  11. B

    Is BIG BATTERY full of Crap??

    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...
  12. B

    Is BIG BATTERY full of Crap??

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

    BMV-712 low temp relay used for battery heat controller ?

    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/
  14. B

    Is BIG BATTERY full of Crap??

    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...
  15. B

    Daly high current question

    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...
Back
Top