05-07-2020, 10:37 PM
(This post was last modified: 05-07-2020, 10:43 PM by Crimp Daddy.)

(05-07-2020, 09:21 PM)floydR Wrote: sorry I don't, and at the moment I can't find it. so I can't even measure the ohms.

Email sent to the seller. When I hear back or find it and measure I will post what I find out

later floyd

found the element 1- 1.2 ohms does that sound right?

I got it because it was for 24 volt.

Doesn't seem that accurate based on the description... at 24 volts and 1 ohm it would draw 24 amps, which is 576 watts. 1.2 ohms would be even less at 480 watts.

This is why I like those resistors I linked... they have published resistance values which allows you to just do the calcs and figure out the best setup for your needs.

You can also just get a bunch and arrangement them in series or parallel to accommodate different voltages / watt load for the charger.

(05-07-2020, 11:22 AM)OffGridInTheCity Wrote: External - Didn't know about this. I have the math right... at 20a discharge.... then 4v(pack)/20a = 0.2Ohm resistor @ 4v*20a = 80watts.

SO, a .2 Ohm reistor @ 100w should work for 20amp discharge? - Like this on ebay?

https://www.ebay.com/itm/100W-Watt-Shell-Power-Aluminum-Housed-Case-Wirewound-Resistor-1-2-4-8-1000-Ohm-/192401667448?_trksid=p2385738.m4383.l4275.c10&var=492385156663

And all I have to do is hook it up on the + side of the power wires and set discharge to 20amps?

As you can see I have had my coffee... your math looks correct. You need 0.185 ohm resistor set for 74 watts of discharge current.

Note: Always use the pack/battery nominal voltage when doing the calcs. But do check it against the max charge voltage to make sure you are not going to exceed what the charger is capable of handling.