Running AC and DC off of the same battery bank

Re: Running AC and DC off of the same battery bank

if the pump is made for 48v, then no problem as long as the batteries can take the total loads without draining down too far. most pumps aren't 48v though so a voltage converter would be needed to take it down to the desired voltage at the desired current.
edit to add:
don't forget that an inverter is a dc load to the battery bank and putting a converter to the batteries would also be another dc load to the battery bank.

Re: Running AC and DC off of the same battery bank

I have plans and parts list & gerber files for PCB, for a 120W, 94% eff 48-12V DC-DC converter. Gives very pure clean DC, core is a commercial telcom product. Parts cost is about $100, and you need surface mount soldering for some tiny LEDs. I can send files if you want, but I think pumps require more than 100w.

You could tap 12V off your bank for a few tiny LED's, but that WILL load some cells more than others, and you may have to Equalize more often to keep things in balance, risking killing 12V worth of batteries.

Grundfos SQFlex pumps run from 30 - 300VDC with internal converter (I think that's how they do it)
Our Host sells them: http://store.solar-electric.com/grsoposuwapu.html

Re: Running AC and DC off of the same battery bank

I've just found another source for some commercial telcom 600W converters, a "sample" evaluation board is $99
>96% eff but only 55V max DC input.

http://vicorpower.com/ http://www.vicorpower.com/products/vichip/ibc/
search for part I048C120T060P1 16V version avaib too.

data sheets http://www.vicorpower.com/documents/datasheets/ds_ibc.pdf