Pump Controllers and why use one
The benefits of water fed pole systems have been widely recognised for many years - in particular the safety of the operator who can clean windows several storeys high from the ground. Across the world water fed pole is a much used and trusted tool of the professional window cleaner.
Carrying the right equipment providing a full capability, plus know-how of when and where the right use of kit is important. By detailing all the options that people have, we can see the why, where, what, when, and how each option could have it benefits: Doing this, in turn, identifies the alternate set-ups that have their own benefits. The Operator then is empowered to increase their efficiency, which reflects in higher hourly rates
A range of systems are available, On-demand trolleys – Backpack – Mobile truck mounted - Traditional and others.
While the ability to connect to a local water supply and produce pure water on a site has advantages there will be occasions when it is necessary to carry the pure water to the site particularly on commercial and domestic building with no external water supply.
A solution would be to carry a tank so water can be taken to site and where available produced on site and stored. Buffer tank systems with a DC delivery pump are very flexible and compact in terms of footprint. The RHG Fill n Go fits this requirement.
Where a tank system is preferable the requirement to pump the water to the brush head becomes a necessity using either a gas powered generator or battery powered pump. When working with a tank based system, water use and battery charge come into play as you want to be as productive as possible from the charge in the battery and the water carried.
Production of pure water requires reverse osmosis and de-ionizing systems, filters, resin and a range of equipment, so again making the most productive use of each tank can earn additional $$$.
At it, most basic what does our pure water professional require in a tank WFP system?
- A water tank
- Hose line
You could think that is it? While this would provide the basis of your system, But is it the most cost effective and efficient system?
In the system above the pump will operate at its maximum at all times, perhaps as much as a gallon a minute or 60 gallons an hour. The pump is also pulling the maximum amount of current (amps) from the battery. Based on a gallon a minute pump, this could be up to 8 amps an hour, draining the battery very quickly.
Add the mechanical pressure on the pump hose lines and connectors which are more likely to fail if constantly working at maximum output, and it is easy to see this is not cost effective. Restrictions caused by the hose means that although the pump is producing maximum output perhaps only 50% of the water volume produced reaches the brush.
What then is an alternative solution
A pump controller added to your system will improve efficiency and provide the opportunity for additional work from the same tank and battery charge.
Using a V11 pump controller allows you to produce the required flow to clean the glass more efficiently. It is possible to reduce pump speed pump current draw and pressure to give the required water volume.
Run flat out the pump will draw 8 amps with perhaps only 50% of the water output reaching the glass. Slowing the pump reduces the current draw from the battery to between 2 & 4 amps meaning the charge in the battery lasts longer. By having the pump produce only the volume required at the glass we can apply the same water volume to the glass efficiently.
How is this possible? Well a hose has a maximum expansion point, If more water is forced into the hose than it can cope with the result is back pressure. In effect the hose now acts as a restriction working against the pump. In a recent test I used a 1.2 GPM pump run at maximum direct from the battery. The pump drew 7 amps of current with volume at the end of 300 feet of hose being 0.5 GPM. Using the same set up with a controller I was able to reduce pump current draw to 4 amps and still have the same 0.5 GPM at the end of 300 feet of hose. The Controller I could produce the same water volume more effciently.
System Pressure - Do we need to work at maximum pressure the whole time?
Running the system at maximum places a very high strain on the pump motor, hose lines, connectors and pump pressure switch. A pump regulator greatly reduces the risk of the pump pressure switch burning out. A pump working at maximum pressure is under a high inductive load (stored energy). The user is relying on the pressure switch to stop the pump when the flow is stopped.
The pump pressure switch cuts in at maximum pressure with the motor under a high load (and high stored energy) thus causing arcing across the circuit which then burns out the pressure switch. Our V11 pump controls use PWM (pulse width modulation) to manage the pump motor and reduce this high inductive load when the water flow and pump are stopped.
At maximum pressure you could have a jet of water up to 15 feet from the brush head, The water is bouncing back off the glass on to you and the ground and it is not cleaning the glass. A controller allows you to manage water volume to give exactly the volume required.Efficiency