signatureCheap (free) load resistors can be made from full rolls of 14 gauge wire. 2.5 ohms per 1000 feet. Get two 1000’ rolls and you have a 5 ohm resistor. 9.8 amps from a 48 volt battery. I put them in a bucket of water to dissipate the heat and keep them from getting heat damage to the insulation.
Then you can return the wire after you are done... From: David via Af Sent: Friday, September 19, 2014 7:04 AM To: [email protected] Subject: Re: [AFMUG] battery tester We are able to time of discharge by reviewing graphs from our CTMs once AC power has stopped. Depending on what the overall current draw is which we find by the load in watts on each port of the CTM. Its not 100% but it gives me a good idea about what we should get out of a AGM 100ah battery. On 09/18/2014 02:57 PM, Chuck McCown via Af wrote: Telemetry.� Just watch the slope of the discharge voltage at night.� I have tried to use impedance meters several times at different companies and cannot get results that predict failures. � If you have a battery that should last several days, disconnect the solar panels and watch the telemetry.� � From: Randy Cosby via Af Sent: Thursday, September 18, 2014 1:06 PM To: [email protected] Subject: [AFMUG] battery tester � Does anyone have a recommended battery tester for AGM and Gel batteries at solar sites?� I have batteries from 100AH to 225AH.� Most of the automotive models seem to be concerned with cold cranking amps, pretty irrelevant for us. -- Randy Cosby InfoWest, Inc 435-674-0165 x 2010 infowest.com This e-mail message contains information from InfoWest, Inc and is for the sole use of the intended recipient(s) and may contain privileged, proprietary or confidential information. Unauthorized use, distribution, review or disclosure is prohibited. If you are not the intended recipient, please contact [email protected] by reply email and destroy the original message, all attachments and copies.
