Bosch L5077 180AH 1000A L5 DEEP CYCLE Q

[vas]

need to replace a few batteries...

er, got 7, probably 2 will be just about good enough for motor starter ones.
System is 24V so got:

1 bank of 2X12V for starting both engines (and running the windlass) I guess I'll also wire the bow thruster there as well
1 bank of 4X12V for domestics

and due to geny starter being 12V and passarelle being 12V, I need a extra 12V battery as well for them (could be an automatic 60Ah, but since I got the space I might as well get a larger one says me...)

Rebuilt battery tray is good enough for 2 rows of 4 180A batteries JUST. Actually front row better have only 3 batteries, which suits me right.
A Victron is charging them with no issues and currently on 24/7 on shore power.
Need to get a method of charging the sole 12V bank. Gene (once running) will charge the battery but probably need to invest in an intelligent 12V charger for this as well.

Saw these Bosch allegedly deep cycle batteries on offer for 185euro each (by returning your old batteries which is fine for me) and I'm thinking of getting 4 for my domestic bank.
Mind currently the 4 batteries in the domestic bank can keep a 90lt fridge running for around 5h in 30deg ambient, then kaput.

Am I right in thinking that deep charge is just Calcium in the system so that it doesn't loose charge too quickly and doesn't damage the anodes or something rather, don't remember someone gave me a lecture last year, wasn't that interesting though...

OK, to conclude:
shall I get them or not?
Any good and for the price? (cheapest by almost a tenner from any online/real shop I've found them in)
alternative is to pay 220 for 180Ah Banner ones locally

cheers

V.

 

[Prhperio]

I'm no expert and I'm sure others will jump in to give more detail but my understanding of deep cycle batteries is that the plates are thicker relative to engine start batteries. The upshot of this is that they stand deeper discharge without damage but cannot deliver such a high peak amperage. So for engine start you want a lot of amps over a short period and the thinner plates give a higher energy density and will deliver a greater current but won't stand being discharged to a low level. The deep cycle battery is the converse and whilst you won't get such a high peak amperage out of it, you can discharge it to a greater extent without damage.

I'm afraid you'll have to wait for others to comment on the chemistry...

HTH

Paul

 

[vas]

thanks for the reply,

Was planning to stick to "normal" batteries for the engines, although tbh I doubt the Bosch wont be man enough to start a 7lt truck engine... They are 1000crank Amps or whatever!

what confuses me is that a neighbouring boat has 2 deep cycle batteries and they come with some thin/flat terminals unlike anything else I've seen. He told me that deep cycle are always like that, go figure...

cheers

V.

 

[Prhperio]

I'm sure you're right re choice of batteries... ie regular "truck" batteries for engine start and then deep cycle for domestics (apart from anything else the deep cycle ones are pricier). I guess it wouldn't do any harm to be able to connect everything together if in extremis the engine start batteries discharge though normally if they're only doing engine start that shouldn't be a problem especially as the Victron is keeping an eye on them. As a matter of interest I'm sure that I've seen batteries on cars with those flat plates you mention so can't see that they're only for deep cycle batteries but I'm more than happy to be corrected if it turns out that I'm haing a senior moment

Best wishes

Paul

 

[grumpy_o_g]

thanks for the reply,

Was planning to stick to "normal" batteries for the engines, although tbh I doubt the Bosch wont be man enough to start a 7lt truck engine... They are 1000crank Amps or whatever!

what confuses me is that a neighbouring boat has 2 deep cycle batteries and they come with some thin/flat terminals unlike anything else I've seen. He told me that deep cycle are always like that, go figure...

cheers

V.

It makes sense in a way as a deep cycle battery would tend to deliver less current so the actual terminal wouldn't need to be so beefy. It's the actual plates inside the battery that should be slightly thicker.