[Stoots]

Few questions really.

Approx how long will a 12 9ah battery trolley?

will a 70ah battery last all day if i use a van mount

and what flow rate is ideal for a pump

the amp draw on my pump say 3amp not sure if that 3amps per hour?

Do i NEED a leisure battery charger or will a car charger work ok?

only looking for a rough estimate guys ta

[Spruce]

Few questions really.

Approx how long will a 12 9ah battery trolley?

If your pump is using 3 amps, then the battery will theoretically last 3 hours before its flat.

will a 70ah battery last all day if i use a van mount

If your pump is using 3 amps per hour then it will last all day. We assume that if you are working for 8 hours, you would probably only spend 1/2 that time actually on the glass doing normal residential work. (Commercial we find is different and we spend about 6 hours on the glass in an 8 hour day.) The remainder of the time will be taken up packing and unpacking, paperwork and wiping downstairs cills and doors (in our case and talking in my case.) If this is so then you would use 12 amps of power that day (4 x 3 = 12) leaving you with 58 amps (70 - 12). You could get away with recharging your battery every 2nd evening.

and what flow rate is ideal for a pump

This is your personal choice. I like about 2 LPM water flow. That consumes about 4.5 amps on my Shurflo pump. We use flow controllers to regulate water flow as required. We might kick the flow rate up doing a first clean or a conservatory roof clean.

the amp draw on my pump say 3amp not sure if that 3amps per hour?

Yes, it will be 3 amps per hour. Sometimes manufacturers mislead you with amp draw on pumps.
Shurflo have given the following amp draw on their 5.2 LPM pump;

psi         LPM           amp draw

0             4.0             2.3
10           3.7             2.9
20           3.5             3.4
30           3.4             4.0
40           3.2             4.3
50           3.0             4.6
60           2.8             4.9
70           2.6             5.3
80           2.5             5.6
90           2.3             5.9      
100          2.1             6.2

and that is pretty much how we see it on the amp meter.


Do i NEED a leisure battery charger or will a car charger work ok?


If you have a leisure battery then it is recommended that you use the correct battery charger - a leisure one. Numax, a respected leisure battery manufacturer have suggested that a battery charger's output should be around 10% of the battery's capacity. So you would need something delivering about 8amps. We use a 10 amp charger on batteries from 85 amp (we have 2 vans with these in) and my van is a twin operator with a 110 amph leisure battery.


only looking for a rough estimate guys ta

Answers in red.