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Post by Deleted on Nov 17, 2016 7:57:56 GMT
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Post by tonyqj on Nov 17, 2016 8:20:23 GMT
Anyone know what the volt drop is across one of these? None - it's just a relay in a box with a bit of electronics driving the coil. However, as it's Durite, take the current capacity with a pinch of salt. It'll be fine if your alternator is wired to your domestics and only the starter battery charge is travelling through it. |
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Post by Deleted on Nov 17, 2016 8:28:34 GMT
Wont volt drop be proportional to current  I use one to connect my two banks charged by two alternators, does what it says at a reasonable price. |
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Post by Deleted on Nov 17, 2016 8:33:07 GMT
Anyone know what the volt drop is across one of these? None - it's just a relay in a box with a bit of electronics driving the coil. However, as it's Durite, take the current capacity with a pinch of salt. It'll be fine if your alternator is wired to your domestics and only the starter battery charge is travelling through it. Cheers, I thought that might be the case. That's the intended way of wiring it up. |
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Post by Deleted on Nov 17, 2016 8:36:45 GMT
Wont volt drop be proportional to current I use one to connect my two banks charged by two alternators, does what it says at a reasonable price. I've got a little bit of rejigging to do over the winter to include a little automation of the charging setup over our current changeover switch - reasonably happy with that but it could do with an upgrade. |
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Post by tonyqj on Nov 17, 2016 8:38:10 GMT
Wont volt drop be proportional to current Bet you don't have a meter sensitive enough to measure it |
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Post by JohnV on Nov 17, 2016 8:41:10 GMT
Wont volt drop be proportional to current Bet you don't have a meter sensitive enough to measure it bet you can .......................................... when it's open  |
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Post by tonyqj on Nov 17, 2016 8:44:41 GMT
Bet you don't have a meter sensitive enough to measure it bet you can .......................................... when it's open Bet you can't measure the current at that time 😝 |
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Post by Deleted on Nov 17, 2016 8:48:54 GMT
Wont volt drop be proportional to current Bet you don't have a meter sensitive enough to measure it Fluke 8026a with a 200mv range is the best I have old but still in calibration. |
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Post by tonyqj on Nov 17, 2016 8:50:19 GMT
Bet you don't have a meter sensitive enough to measure it Fluke 8026a with a 200mv range is the best I have old but still in calibration. You might just then  |
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Post by Gone on Nov 17, 2016 8:56:02 GMT
Wont volt drop be proportional to current ........................................ Volt drop is the result of current AND resistance. The contacts in good condition will have a very low resistance so the volt drop will be minimal. A quick look on the internet finds Omron 100A power relay has having a typical contact resistance of 0.6m ohm (0.0006 ohm). The spec sheet shows volt drop at 60% current of 0.1V |
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