Ian_Edwards
Well-Known Member
I'm looking at using a Yuasa YBX9096 battery close to the bow thruster to provide the thruster with a few more amps.
It a long way from the 500 amp hour domestic bank and although there are very heavy cables feeding the thruster, there must be a significant voltage drop, because it's a 12v 5 Kwatt thruster and if the voltage drops to 10 volts, it could take 500 amps.
The Yuasa would be connected in parallel with the domestic bank, but with very short cables to the thruster, so would probably see most of the load.
I have two questions about the Yuasa YBX9096:
1) Cold Cranking Amps (EN1) is 760 amps at -18C, how much more is it likely to provide at say +10C? The reason for asking is that EN1, allows the battery voltage to drop to 7.5 volts after 10 seconds. 7.5volts is much lower than I want to go.
2) The spec' sheet say that the "Recommended Charge Rate is 4A". That seems very low for a 70 amp hr battery. My shore charger is a 3 stage 100 amp unit and the alternator has a 140 amp max output, so potentially the Yuasa could see a lot more than 4 amps when charging. I'm I likely to fry the battery?
The Yuasa YBX9096 is an AGM battery, and I don't want to spend a lot of money on a battery (there are some very good deals going on Yuasa YBX9096 at the moment) to go into the anchor locker. Although I'll protect it an epoxy coated plywood, it's likely to get knackered by sea water.
It a long way from the 500 amp hour domestic bank and although there are very heavy cables feeding the thruster, there must be a significant voltage drop, because it's a 12v 5 Kwatt thruster and if the voltage drops to 10 volts, it could take 500 amps.
The Yuasa would be connected in parallel with the domestic bank, but with very short cables to the thruster, so would probably see most of the load.
I have two questions about the Yuasa YBX9096:
1) Cold Cranking Amps (EN1) is 760 amps at -18C, how much more is it likely to provide at say +10C? The reason for asking is that EN1, allows the battery voltage to drop to 7.5 volts after 10 seconds. 7.5volts is much lower than I want to go.
2) The spec' sheet say that the "Recommended Charge Rate is 4A". That seems very low for a 70 amp hr battery. My shore charger is a 3 stage 100 amp unit and the alternator has a 140 amp max output, so potentially the Yuasa could see a lot more than 4 amps when charging. I'm I likely to fry the battery?
The Yuasa YBX9096 is an AGM battery, and I don't want to spend a lot of money on a battery (there are some very good deals going on Yuasa YBX9096 at the moment) to go into the anchor locker. Although I'll protect it an epoxy coated plywood, it's likely to get knackered by sea water.
