Dialysis system including supplemental power source

1. A dialysis system comprising:

a water purification unit;

a dialysate generation unit configured to use water purified by the water purification unit;

a dialysate delivery unit configured to deliver dialysate prepared by the dialysate generation unit;

a supplemental power source; and

electrical circuitry configured such that a branch power source and the supplemental power source share a power load required by the water purification unit, the dialysate generation unit and the dialysate delivery unit.

2. The dialysis system of claim 1 , wherein the electrical circuitry includes (i) a first electrical connection configured to electrically connect the branch power source with at least one of the water purification unit, the dialysate generation unit and the dialysate delivery unit, and (ii) a second electrical connection configured to electrically connect the supplemental power source with at least one of the water purification unit, the dialysate generation unit and the dialysate delivery unit.

3. The dialysis system of claim 2 , wherein the electrical circuitry includes a third electrical connection configured to electrically connect the branch power source to the supplemental power source to allow the branch power source to charge the supplemental power source.

4. The dialysis system of claim 2 , which includes (i) a first switch located in the first electrical connection to electrically connect the branch power source with the water purification unit, the dialysate generation unit and the dialysate delivery unit, and (ii) a second switch located in the second electrical connection to electrically connect the supplemental power source with at least one of the water purification unit, the dialysate generation unit and the dialysate delivery unit.

5. The dialysis system of claim 4 , which includes a third switch located in a third electrical connection that electrically connects the branch power source with the supplemental power source.

6. The dialysis system of claim 1 , wherein during low power, the supplemental power source is configured to be the only power source to power the water purification unit, the dialysate generation unit and the dialysate delivery unit.

7. The dialysis system of claim 1 , wherein the electrical circuitry includes first and second electrical connections electrically connecting the branch power source with the water purification unit, the dialysate generation unit and the dialysate delivery unit.

8. The dialysis system of claim 1 , wherein the electrical circuitry includes first and second electrical connections electrically connecting the supplemental power source with the water purification unit.

9. The dialysis system of claim 1 , wherein the electrical circuitry includes first and second electrical connections electrically connecting the branch power source with the dialysate delivery unit.

10. The dialysis system of claim 1 , wherein the electrical circuitry includes first and second electrical connections electrically connecting the supplemental power source with the water purification unit and the dialysate preparation unit.

11. The dialysis system of claim 1 , wherein the supplemental power source is configured to be the only power source to power the dialysate delivery unit.

12. The dialysis system of claim 1 , which includes a logic implementer programmed to selectively allow (i) the branch power source to charge the supplemental power source; and (ii) the branch power source and the supplemental power source to share the power load required by the water purification unit, the dialysate generation unit and the dialysate delivery unit.

13. The dialysis system of claim 1 , wherein the branch power source is configured to power one or more of the water purification unit, the dialysate generation unit and the dialysate delivery unit, and the supplemental power source is configured to power the remainder of the water purification unit, the dialysate generation unit and the dialysate delivery unit.