I was thinking of mounting the water heat elements into an aluminum
plate, laying the plate flat over a 55 gallon drum and filling the water
level up to the plate. Stratified water may make the top pretty hot but
I guess it will work.
Larry
On 3/17/15 1:07 PM, Ray Walters wrote:
Those look like your solution. Also water can take more heat with
less trouble than air heaters. I've had air heaters start melting
things, etc. You can just install those in the side of a 55 gal
barrel with a bulkhead fitting, or yes, weld the appropriate plumbing
fitting to the side of the barrel. Might even be able to install them
into a section of pipe with Ts and run water through it to cool the
elements.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 3/17/2015 1:40 PM, Larry wrote:
Hey Ray,
I remember seeing huge banks of light bulbs as loads back in the
early 70's.
I need to test the entire bank as one unit as the first cell of 32 to
reach 2.8 volts determines the capacity for the bank. I just saw Home
Depot has a 2kW 120 volt water heater for $10. Guess I need to do
some welding.
Thank you,
Larry Crutcher
Starlight Solar Power Systems
On 3/17/15 11:59 AM, Ray Walters wrote:
Hi Larry,
I think you hit on the best load already: water heater elements
rated for 120 v. We have also used dump loads for wind turbines
like the air heating elements from Bergey, but they are only about 1
kW each. Another possible source are the resistor banks for old
golf carts (before they had controllers, they used resistor banks to
operate at slow speeds)
A very long time ago, an inverter company had a demonstration that
used a large bank of incandescent light bulbs. They used to make a
300 watt bulb for mining, so 33 of those would work. (maybe a few
more bulbs, since your voltage is bit lower than 120 v) Cheap
electric space heaters would work too. You also might look around
at an electronics surplus store.
Whatever you do, it sounds like a lot of time and work to set up.
Any chance of doing a smaller load test for subsets of the total
bank? You might be able to use a standard 12 v battery load tester
then.
Good Luck.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 3/17/2015 12:41 PM, Larry wrote:
I am repairing and restoring a pair of poorly designed lithium-ion
battery bank that suffered over discharge, damaging many cells.
After cell replacement I need to perform a discharge test with a
10kW load to verify the remaining capacity. The battery voltage is
105 volts @ 100% SoC and 89.6 volts @ 0%
I would like advice on how I can create an economical 10kW load.
Water heating element? Wire wound resistors? Are there any GT
inverters that will operate at these voltages?
Thanks.
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